The desert area seemed pretty bland visually. I would suggest including some different complimentary colors in the mix. Hell, maybe change the whole color scheme of the area, yellow themed deserts have appeared everywhere at this point.

Battle system seems too simple. This might change later on, but there was no reason not to use the pipe rather than the fist.

Battle system was a bit boring visually. The bar at the bottom blended in way too much with the surroundings. Maybe think of redesigning it.

Certain graphical ugly spots in some places. The Guy's hat is kinda weird looking, and the pixels kinda smash together.

Overall, it was a pretty fun short time, and I look forward to seeing how you'll develop this in the future!